USDA APHIS · Animal health alert · June 3, 2026
USDA confirms New World screwworm in a Texas calf
USDA APHIS confirmed New World screwworm in a calf in Zavala County, Texas. APHIS describes NWS as a serious pest affecting livestock, pets, wildlife, and sometimes people and birds; larvae burrow into the flesh of living animals and can cause serious tissue damage.